This sale is for a very good condition Mamiya 645 No. 2 Extension Tube tube for all Mamiya 645 and M645 series manual focus cameras.
This tube has only normal minor signs of use with typical paint loss on the mount and the usual marking at the front marking from connecting lenses. It is in perfect working order.
This extension tube will give you 0.29 to 0.45x magnification with a standard 80mm lens; a copy of the Mamiya instruction leaflet can be downloaded from the Downloads section. I tend to use this and the #1 and #3 rings just to get a closer focus with my 150mm and 210mm lenses – it is so small that it is no problem to carry around in case you need it.